Thanks for your continued help; I'm afraid I'm running into a real block here when it comes to making sense of this strace.
https://pastebin.com/a8WD93Na root [ ~ ]# ls -lah /dev/xen/privcmd crw-rw---- 1 root qubes 10, 58 Oct 24 2018 /dev/xen/privcmd The line "read(4," is really where the trace ends--stays there indefinitely. No change to this behavior even if qubes-qrexec-agent.service is stopped/running. I've also then rebuilt qubes-vmm-xen, qubes-linux-utils, and qubes-core-agent-linux for good measure, with the same strace results. -- You received this message because you are subscribed to the Google Groups "qubes-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-devel+unsubscr...@googlegroups.com. To post to this group, send email to qubes-devel@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-devel/9206cb4e-773f-43e3-9e02-acaa9c3238ff%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.